Top definition
Includes feeling regretful,and outlandishly weird after a sexual encounter. Usually on one night stands. Most notably, you are not attracted to the person afterwards.

Bob -"Hey Dude...did you fuck her?"

Joe -"Awe shit man, it was a Jizz-Kill Theory."

Joe - "After I got done, I felt like I wanted to hang myself."

Bob - "YES! I warned you about the Jizz-Kill Theory"
by Yeha_Brother August 30, 2008
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